Underinflation detector

Details Underinflation detector Underinflation detector

2005-03-08

2005-03-08

Jeanglaude, Gertrude A. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Vehicle diagnosis or maintenance indication

C701S030000, C701S041000, C701S081000, C701S093000, C340S441000, C340S444000

Reexamination Certificate

active

06865456

ABSTRACT:
A rotational speed V1of a left front wheel T1, a rotational speed V2of a right front wheel T2, a rotational speed V3of a left rear wheel T3, and a rotational speed V4of a right rear wheel T4are detected by rotational speed sensors S1-S4, respectively. A front-wheel yaw rate γF arising due to a rotational speed difference between the front wheels T1, T2and a rear-wheel yaw rate γR arising due to a rotational speed difference between the rear wheels T3, T4are monitored. When a significant disparity between the both rotational speed differences is observed, it is determined that tire inflation pressure of any of the wheels T1-T4has decreased. Upon detection, correction is made to an apparent yaw rate that would be observed in the properly inflated wheel as a result of steering for correction by a driver, thereby improving detection accuracy of underinflation of the tires.

REFERENCES:
patent: 4825368 (1989-04-01), Itoh et al.
patent: 5409302 (1995-04-01), Chabbert
patent: 6313742 (2001-11-01), Larson
patent: 6426694 (2002-07-01), Larson
patent: 49-85701 (1974-08-01), None
patent: 06-092114 (1994-04-01), None

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